/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FUEL.
 *
 * The Initial Developer of the Original Code is Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Mark Finkle <mfinkle@mozilla.com> (Original Author)
 *  John Resig  <jresig@mozilla.com> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

const Ci = Components.interfaces;
const Cc = Components.classes;

Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");

//=================================================
// Singleton that holds services and utilities
var Utilities = {
    _bookmarks: null,
    get bookmarks() {
        if (!this._bookmarks) {
            this._bookmarks = Cc["@mozilla.org/browser/nav-bookmarks-service;1"].getService(Ci.nsINavBookmarksService);
        }
        return this._bookmarks;
    },

    _livemarks: null,
    get livemarks() {
        if (!this._livemarks) {
            this._livemarks = Cc["@mozilla.org/browser/livemark-service;2"].getService(Ci.nsILivemarkService);
        }
        return this._livemarks;
    },

    _annotations: null,
    get annotations() {
        if (!this._annotations) {
            this._annotations = Cc["@mozilla.org/browser/annotation-service;1"].getService(Ci.nsIAnnotationService);
        }
        return this._annotations;
    },

    _history: null,
    get history() {
        if (!this._history) {
            this._history = Cc["@mozilla.org/browser/nav-history-service;1"].getService(Ci.nsINavHistoryService);
        }
        return this._history;
    },

    _windowMediator: null,
    get windowMediator() {
        if (!this._windowMediator) {
            this._windowMediator = Cc["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);
        }
        return this._windowMediator;
    },

    makeURI: function(aSpec) {
        if (!aSpec) return null;
        var ios = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
        return ios.newURI(aSpec, null, null);
    },

    free: function() {
        this._bookmarks = null;
        this._livemarks = null;
        this._annotations = null;
        this._history = null;
        this._windowMediator = null;
    }
};

//=================================================
// Window implementation
function Window(aWindow) {
    this._window = aWindow;
    this._tabbrowser = aWindow.getBrowser();
    this._events = new Events();
    this._cleanup = {};

    this._watch("TabOpen");
    this._watch("TabMove");
    this._watch("TabClose");
    this._watch("TabSelect");

    var self = this;
    gShutdown.push(function() {
        self._shutdown();
    });
}

Window.prototype = {
    get events() {
        return this._events;
    },

    /*
   * Helper used to setup event handlers on the XBL element. Note that the events
   * are actually dispatched to tabs, so we capture them.
   */
    _watch: function win_watch(aType) {
        var self = this;
        this._tabbrowser.addEventListener(aType, this._cleanup[aType] = function(e) {
            self._event(e);
        },
        true);
    },

    /*
   * Helper event callback used to redirect events made on the XBL element
   */
    _event: function win_event(aEvent) {
        this._events.dispatch(aEvent.type, new BrowserTab(this, aEvent.originalTarget.linkedBrowser));
    },

    get tabs() {
        var tabs = [];
        var browsers = this._tabbrowser.browsers;

        for (var i = 0; i < browsers.length; i++) tabs.push(new BrowserTab(this, browsers[i]));
        return tabs;
    },

    get activeTab() {
        return new BrowserTab(this, this._tabbrowser.selectedBrowser);
    },

    open: function win_open(aURI) {
        return new BrowserTab(this, this._tabbrowser.addTab(aURI.spec).linkedBrowser);
    },

    _shutdown: function win_shutdown() {
        for (var type in this._cleanup) this._tabbrowser.removeEventListener(type, this._cleanup[type], true);
        this._cleanup = null;

        this._window = null;
        this._tabbrowser = null;
        this._events = null;
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.fuelIWindow])
};

//=================================================
// BrowserTab implementation
function BrowserTab(aFUELWindow, aBrowser) {
    this._window = aFUELWindow;
    this._tabbrowser = aFUELWindow._tabbrowser;
    this._browser = aBrowser;
    this._events = new Events();
    this._cleanup = {};

    this._watch("load");

    var self = this;
    gShutdown.push(function() {
        self._shutdown();
    });
}

BrowserTab.prototype = {
    get uri() {
        return this._browser.currentURI;
    },

    get index() {
        var tabs = this._tabbrowser.mTabs;
        for (var i = 0; i < tabs.length; i++) {
            if (tabs[i].linkedBrowser == this._browser) return i;
        }
        return - 1;
    },

    get events() {
        return this._events;
    },

    get window() {
        return this._window;
    },

    get document() {
        return this._browser.contentDocument;
    },

    /*
   * Helper used to setup event handlers on the XBL element
   */
    _watch: function bt_watch(aType) {
        var self = this;
        this._browser.addEventListener(aType, this._cleanup[aType] = function(e) {
            self._event(e);
        },
        true);
    },

    /*
   * Helper event callback used to redirect events made on the XBL element
   */
    _event: function bt_event(aEvent) {
        if (aEvent.type == "load") {
            if (! (aEvent.originalTarget instanceof Ci.nsIDOMHTMLDocument)) return;

            if (aEvent.originalTarget.defaultView instanceof Ci.nsIDOMWindowInternal && aEvent.originalTarget.defaultView.frameElement) return;
        }

        this._events.dispatch(aEvent.type, this);
    },

    /*
   * Helper used to determine the index offset of the browsertab
   */
    _getTab: function bt_gettab() {
        var tabs = this._tabbrowser.mTabs;
        return tabs[this.index] || null;
    },

    load: function bt_load(aURI) {
        this._browser.loadURI(aURI.spec, null, null);
    },

    focus: function bt_focus() {
        this._tabbrowser.selectedTab = this._getTab();
        this._tabbrowser.focus();
    },

    close: function bt_close() {
        this._tabbrowser.removeTab(this._getTab());
    },

    moveBefore: function bt_movebefore(aBefore) {
        this._tabbrowser.moveTabTo(this._getTab(), aBefore.index);
    },

    moveToEnd: function bt_moveend() {
        this._tabbrowser.moveTabTo(this._getTab(), this._tabbrowser.browsers.length);
    },

    _shutdown: function bt_shutdown() {
        for (var type in this._cleanup) this._browser.removeEventListener(type, this._cleanup[type], true);
        this._cleanup = null;

        this._window = null;
        this._tabbrowser = null;
        this._browser = null;
        this._events = null;
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.fuelIBrowserTab])
};

//=================================================
// Annotations implementation
function Annotations(aId) {
    this._id = aId;
}

Annotations.prototype = {
    get names() {
        return Utilities.annotations.getItemAnnotationNames(this._id, {});
    },

    has: function ann_has(aName) {
        return Utilities.annotations.itemHasAnnotation(this._id, aName);
    },

    get: function(aName) {
        if (this.has(aName)) return Utilities.annotations.getItemAnnotation(this._id, aName);
        return null;
    },

    set: function(aName, aValue, aExpiration) {
        Utilities.annotations.setItemAnnotation(this._id, aName, aValue, 0, aExpiration);
    },

    remove: function ann_remove(aName) {
        if (aName) Utilities.annotations.removeItemAnnotation(this._id, aName);
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.fuelIAnnotations])
};

//=================================================
// Bookmark implementation
function Bookmark(aId, aParent, aType) {
    this._id = aId;
    this._parent = aParent;
    this._type = aType || "bookmark";
    this._annotations = new Annotations(this._id);
    this._events = new Events();

    Utilities.bookmarks.addObserver(this, false);

    var self = this;
    gShutdown.push(function() {
        self._shutdown();
    });
}

Bookmark.prototype = {
    _shutdown: function bm_shutdown() {
        this._annotations = null;
        this._events = null;

        Utilities.bookmarks.removeObserver(this);
    },

    get id() {
        return this._id;
    },

    get title() {
        return Utilities.bookmarks.getItemTitle(this._id);
    },

    set title(aTitle) {
        Utilities.bookmarks.setItemTitle(this._id, aTitle);
    },

    get uri() {
        return Utilities.bookmarks.getBookmarkURI(this._id);
    },

    set uri(aURI) {
        return Utilities.bookmarks.changeBookmarkURI(this._id, aURI);
    },

    get description() {
        return this._annotations.get("bookmarkProperties/description");
    },

    set description(aDesc) {
        this._annotations.set("bookmarkProperties/description", aDesc, Ci.nsIAnnotationService.EXPIRE_NEVER);
    },

    get keyword() {
        return Utilities.bookmarks.getKeywordForBookmark(this._id);
    },

    set keyword(aKeyword) {
        Utilities.bookmarks.setKeywordForBookmark(this._id, aKeyword);
    },

    get type() {
        return this._type;
    },

    get parent() {
        return this._parent;
    },

    set parent(aFolder) {
        Utilities.bookmarks.moveItem(this._id, aFolder.id, Utilities.bookmarks.DEFAULT_INDEX);
        // this._parent is updated in onItemMoved
    },

    get annotations() {
        return this._annotations;
    },

    get events() {
        return this._events;
    },

    remove: function bm_remove() {
        Utilities.bookmarks.removeItem(this._id);
    },

    // observer
    onBeginUpdateBatch: function bm_obub() {},

    onEndUpdateBatch: function bm_oeub() {},

    onItemAdded: function bm_oia(aId, aFolder, aIndex) {
        // bookmark object doesn't exist at this point
    },

    onItemRemoved: function bm_oir(aId, aFolder, aIndex) {
        if (this._id == aId) this._events.dispatch("remove", aId);
    },

    onItemChanged: function bm_oic(aId, aProperty, aIsAnnotationProperty, aValue) {
        if (this._id == aId) this._events.dispatch("change", aProperty);
    },

    onItemVisited: function bm_oiv(aId, aVisitID, aTime) {},

    onItemMoved: function bm_oim(aId, aOldParent, aOldIndex, aNewParent, aNewIndex) {
        if (this._id == aId) {
            this._parent = new BookmarkFolder(aNewParent, Utilities.bookmarks.getFolderIdForItem(aNewParent));
            this._events.dispatch("move", aId);
        }
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.fuelIBookmark, Ci.nsINavBookmarkObserver])
};

//=================================================
// BookmarkFolder implementation
function BookmarkFolder(aId, aParent) {
    this._id = aId;
    this._parent = aParent;
    this._annotations = new Annotations(this._id);
    this._events = new Events();

    Utilities.bookmarks.addObserver(this, false);

    var self = this;
    gShutdown.push(function() {
        self._shutdown();
    });
}

BookmarkFolder.prototype = {
    _shutdown: function bmf_shutdown() {
        this._annotations = null;
        this._events = null;

        Utilities.bookmarks.removeObserver(this);
    },

    get id() {
        return this._id;
    },

    get title() {
        return Utilities.bookmarks.getItemTitle(this._id);
    },

    set title(aTitle) {
        Utilities.bookmarks.setItemTitle(this._id, aTitle);
    },

    get description() {
        return this._annotations.get("bookmarkProperties/description");
    },

    set description(aDesc) {
        this._annotations.set("bookmarkProperties/description", aDesc, Ci.nsIAnnotationService.EXPIRE_NEVER);
    },

    get type() {
        return "folder";
    },

    get parent() {
        return this._parent;
    },

    set parent(aFolder) {
        Utilities.bookmarks.moveItem(this._id, aFolder.id, Utilities.bookmarks.DEFAULT_INDEX);
        // this._parent is updated in onItemMoved
    },

    get annotations() {
        return this._annotations;
    },

    get events() {
        return this._events;
    },

    get children() {
        var items = [];

        var options = Utilities.history.getNewQueryOptions();
        var query = Utilities.history.getNewQuery();
        query.setFolders([this._id], 1);
        var result = Utilities.history.executeQuery(query, options);
        var rootNode = result.root;
        rootNode.containerOpen = true;
        var cc = rootNode.childCount;
        for (var i = 0; i < cc; ++i) {
            var node = rootNode.getChild(i);
            if (node.type == node.RESULT_TYPE_FOLDER) {
                var folder = new BookmarkFolder(node.itemId, this._id);
                items.push(folder);
            } else if (node.type == node.RESULT_TYPE_SEPARATOR) {
                var separator = new Bookmark(node.itemId, this._id, "separator");
                items.push(separator);
            } else {
                var bookmark = new Bookmark(node.itemId, this._id, "bookmark");
                items.push(bookmark);
            }
        }
        rootNode.containerOpen = false;

        return items;
    },

    addBookmark: function bmf_addbm(aTitle, aUri) {
        var newBookmarkID = Utilities.bookmarks.insertBookmark(this._id, aUri, Utilities.bookmarks.DEFAULT_INDEX, aTitle);
        var newBookmark = new Bookmark(newBookmarkID, this, "bookmark");
        return newBookmark;
    },

    addSeparator: function bmf_addsep() {
        var newBookmarkID = Utilities.bookmarks.insertSeparator(this._id, Utilities.bookmarks.DEFAULT_INDEX);
        var newBookmark = new Bookmark(newBookmarkID, this, "separator");
        return newBookmark;
    },

    addFolder: function bmf_addfolder(aTitle) {
        var newFolderID = Utilities.bookmarks.createFolder(this._id, aTitle, Utilities.bookmarks.DEFAULT_INDEX);
        var newFolder = new BookmarkFolder(newFolderID, this);
        return newFolder;
    },

    remove: function bmf_remove() {
        Utilities.bookmarks.removeFolder(this._id);
    },

    // observer
    onBeginUpdateBatch: function bmf_obub() {},

    onEndUpdateBatch: function bmf_oeub() {},

    onItemAdded: function bmf_oia(aId, aFolder, aIndex) {
        // handle root folder events
        if (!this._parent) this._events.dispatch("add", aId);

        // handle this folder events
        if (this._id == aFolder) this._events.dispatch("addchild", aId);
    },

    onItemRemoved: function bmf_oir(aId, aFolder, aIndex) {
        // handle root folder events
        if (!this._parent || this._id == aId) this._events.dispatch("remove", aId);

        // handle this folder events
        if (this._id == aFolder) this._events.dispatch("removechild", aId);
    },

    onItemChanged: function bmf_oic(aId, aProperty, aIsAnnotationProperty, aValue) {
        // handle root folder and this folder events
        if (!this._parent || this._id == aId) this._events.dispatch("change", aProperty);
    },

    onItemVisited: function bmf_oiv(aId, aVisitID, aTime) {},

    onItemMoved: function bmf_oim(aId, aOldParent, aOldIndex, aNewParent, aNewIndex) {
        // handle this folder event, root folder cannot be moved
        if (this._id == aId) {
            this._parent = new BookmarkFolder(aNewParent, Utilities.bookmarks.getFolderIdForItem(aNewParent));
            this._events.dispatch("move", aId);
        }
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.fuelIBookmarkFolder, Ci.nsINavBookmarkObserver])
};

//=================================================
// BookmarkRoots implementation
function BookmarkRoots() {
    var self = this;
    gShutdown.push(function() {
        self._shutdown();
    });
}

BookmarkRoots.prototype = {
    _shutdown: function bmr_shutdown() {
        this._menu = null;
        this._toolbar = null;
        this._tags = null;
        this._unfiled = null;
    },

    get menu() {
        if (!this._menu) this._menu = new BookmarkFolder(Utilities.bookmarks.bookmarksMenuFolder, null);

        return this._menu;
    },

    get toolbar() {
        if (!this._toolbar) this._toolbar = new BookmarkFolder(Utilities.bookmarks.toolbarFolder, null);

        return this._toolbar;
    },

    get tags() {
        if (!this._tags) this._tags = new BookmarkFolder(Utilities.bookmarks.tagsFolder, null);

        return this._tags;
    },

    get unfiled() {
        if (!this._unfiled) this._unfiled = new BookmarkFolder(Utilities.bookmarks.unfiledBookmarksFolder, null);

        return this._unfiled;
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.fuelIBookmarkRoots])
};

//=================================================
// Factory - Treat Application as a singleton
// XXX This is required, because we're registered for the 'JavaScript global
// privileged property' category, whose handler always calls createInstance.
// See bug 386535.
var gSingleton = null;
var ApplicationFactory = {
    createInstance: function af_ci(aOuter, aIID) {
        if (aOuter != null) throw Components.results.NS_ERROR_NO_AGGREGATION;

        if (gSingleton == null) {
            gSingleton = new Application();
        }

        return gSingleton.QueryInterface(aIID);
    }
};

//=================================================
// Application constructor
function Application() {
    this.initToolkitHelpers();
    this._bookmarks = null;
}

//=================================================
// Application implementation
Application.prototype = {
    // for nsIClassInfo + XPCOMUtils
    classDescription: "Application",
    classID: Components.ID("fe74cf80-aa2d-11db-abbd-0800200c9a66"),
    contractID: "@mozilla.org/fuel/application;1",

    // redefine the default factory for XPCOMUtils
    _xpcom_factory: ApplicationFactory,

    // for nsISupports
    QueryInterface: XPCOMUtils.generateQI([Ci.fuelIApplication, Ci.extIApplication, Ci.nsIObserver, Ci.nsIClassInfo]),

    getInterfaces: function app_gi(aCount) {
        var interfaces = [Ci.fuelIApplication, Ci.extIApplication, Ci.nsIObserver, Ci.nsIClassInfo];
        aCount.value = interfaces.length;
        return interfaces;
    },

    // for nsIObserver
    observe: function app_observe(aSubject, aTopic, aData) {
        // Call the extApplication version of this function first
        this.__proto__.__proto__.observe.call(this, aSubject, aTopic, aData);
        if (aTopic == "xpcom-shutdown") {
            this._bookmarks = null;
            Utilities.free();
        }
    },

    get bookmarks() {
        if (this._bookmarks == null) this._bookmarks = new BookmarkRoots();

        return this._bookmarks;
    },

    get windows() {
        var win = [];
        var enum = Utilities.windowMediator.getEnumerator("navigator:browser");

        while (enum.hasMoreElements()) win.push(new Window(enum.getNext()));

        return win;
    },

    get activeWindow() {
        return new Window(Utilities.windowMediator.getMostRecentWindow("navigator:browser"));
    }
};

//module initialization
function NSGetModule(aCompMgr, aFileSpec) {
    // set the proto, defined in extApplication.js
    Application.prototype.__proto__ = extApplication.prototype;
    return XPCOMUtils.generateModule([Application]);
}

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FUEL.
 *
 * The Initial Developer of the Original Code is Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Mark Finkle <mfinkle@mozilla.com> (Original Author)
 *  John Resig  <jresig@mozilla.com> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

//=================================================
// Shutdown - used to store cleanup functions which will
//            be called on Application shutdown
var gShutdown = [];

//=================================================
// Console constructor
function Console() {
    this._console = Components.classes["@mozilla.org/consoleservice;1"].getService(Ci.nsIConsoleService);
}

//=================================================
// Console implementation
Console.prototype = {
    log: function cs_log(aMsg) {
        this._console.logStringMessage(aMsg);
    },

    open: function cs_open() {
        var wMediator = Components.classes["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);
        var console = wMediator.getMostRecentWindow("global:console");
        if (!console) {
            var wWatch = Components.classes["@mozilla.org/embedcomp/window-watcher;1"].getService(Ci.nsIWindowWatcher);
            wWatch.openWindow(null, "chrome://global/content/console.xul", "_blank", "chrome,dialog=no,all", null);
        } else {
            // console was already open
            console.focus();
        }
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extIConsole])
};

//=================================================
// EventItem constructor
function EventItem(aType, aData) {
    this._type = aType;
    this._data = aData;
}

//=================================================
// EventItem implementation
EventItem.prototype = {
    _cancel: false,

    get type() {
        return this._type;
    },

    get data() {
        return this._data;
    },

    preventDefault: function ei_pd() {
        this._cancel = true;
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extIEventItem])
};

//=================================================
// Events constructor
function Events() {
    this._listeners = [];
}

//=================================================
// Events implementation
Events.prototype = {
    addListener: function evts_al(aEvent, aListener) {
        if (this._listeners.some(hasFilter)) return;

        this._listeners.push({
            event: aEvent,
            listener: aListener
        });

        function hasFilter(element) {
            return element.event == aEvent && element.listener == aListener;
        }
    },

    removeListener: function evts_rl(aEvent, aListener) {
        this._listeners = this._listeners.filter(hasFilter);

        function hasFilter(element) {
            return element.event != aEvent && element.listener != aListener;
        }
    },

    dispatch: function evts_dispatch(aEvent, aEventItem) {
        eventItem = new EventItem(aEvent, aEventItem);

        this._listeners.forEach(function(key) {
            if (key.event == aEvent) {
                key.listener.handleEvent ? key.listener.handleEvent(eventItem) : key.listener(eventItem);
            }
        });

        return ! eventItem._cancel;
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extIEvents])
};

//=================================================
// PreferenceBranch constructor
function PreferenceBranch(aBranch) {
    if (!aBranch) aBranch = "";

    this._root = aBranch;
    this._prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefService);

    if (aBranch) this._prefs = this._prefs.getBranch(aBranch);

    this._prefs.QueryInterface(Ci.nsIPrefBranch);
    this._prefs.QueryInterface(Ci.nsIPrefBranch2);

    // we want to listen to "all" changes for this branch, so pass in a blank domain
    this._prefs.addObserver("", this, true);
    this._events = new Events();

    var self = this;
    gShutdown.push(function() {
        self._shutdown();
    });
}

//=================================================
// PreferenceBranch implementation
PreferenceBranch.prototype = {
    // cleanup observer so we don't leak
    _shutdown: function prefs_shutdown() {
        this._prefs.removeObserver(this._root, this);

        this._prefs = null;
        this._events = null;
    },

    // for nsIObserver
    observe: function prefs_observe(aSubject, aTopic, aData) {
        if (aTopic == "nsPref:changed") this._events.dispatch("change", aData);
    },

    get root() {
        return this._root;
    },

    get all() {
        return this.find({});
    },

    get events() {
        return this._events;
    },

    // XXX: Disabled until we can figure out the wrapped object issues
    // name: "name" or /name/
    // path: "foo.bar." or "" or /fo+\.bar/
    // type: Boolean, Number, String (getPrefType)
    // locked: true, false (prefIsLocked)
    // modified: true, false (prefHasUserValue)
    find: function prefs_find(aOptions) {
        var retVal = [];
        var items = this._prefs.getChildList("", []);

        for (var i = 0; i < items.length; i++) {
            retVal.push(new Preference(items[i], this));
        }

        return retVal;
    },

    has: function prefs_has(aName) {
        return (this._prefs.getPrefType(aName) != Ci.nsIPrefBranch.PREF_INVALID);
    },

    get: function prefs_get(aName) {
        return this.has(aName) ? new Preference(aName, this) : null;
    },

    getValue: function prefs_gv(aName, aValue) {
        var type = this._prefs.getPrefType(aName);

        switch (type) {
        case Ci.nsIPrefBranch2.PREF_STRING:
            aValue = this._prefs.getComplexValue(aName, Ci.nsISupportsString).data;
            break;
        case Ci.nsIPrefBranch2.PREF_BOOL:
            aValue = this._prefs.getBoolPref(aName);
            break;
        case Ci.nsIPrefBranch2.PREF_INT:
            aValue = this._prefs.getIntPref(aName);
            break;
        }

        return aValue;
    },

    setValue: function prefs_sv(aName, aValue) {
        var type = aValue != null ? aValue.constructor.name: "";

        switch (type) {
        case "String":
            var str = Cc["@mozilla.org/supports-string;1"].createInstance(Ci.nsISupportsString);
            str.data = aValue;
            this._prefs.setComplexValue(aName, Ci.nsISupportsString, str);
            break;
        case "Boolean":
            this._prefs.setBoolPref(aName, aValue);
            break;
        case "Number":
            this._prefs.setIntPref(aName, aValue);
            break;
        default:
            throw ("Unknown preference value specified.");
        }
    },

    reset: function prefs_reset() {
        this._prefs.resetBranch("");
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extIPreferenceBranch, Ci.nsISupportsWeakReference])
};

//=================================================
// Preference constructor
function Preference(aName, aBranch) {
    this._name = aName;
    this._branch = aBranch;
    this._events = new Events();

    var self = this;

    this.branch.events.addListener("change",
    function(aEvent) {
        if (aEvent.data == self.name) self.events.dispatch(aEvent.type, aEvent.data);
    });
}

//=================================================
// Preference implementation
Preference.prototype = {
    get name() {
        return this._name;
    },

    get type() {
        var value = "";
        var type = this.branch._prefs.getPrefType(this._name);

        switch (type) {
        case Ci.nsIPrefBranch2.PREF_STRING:
            value = "String";
            break;
        case Ci.nsIPrefBranch2.PREF_BOOL:
            value = "Boolean";
            break;
        case Ci.nsIPrefBranch2.PREF_INT:
            value = "Number";
            break;
        }

        return value;
    },

    get value() {
        return this.branch.getValue(this._name, null);
    },

    set value(aValue) {
        return this.branch.setValue(this._name, aValue);
    },

    get locked() {
        return this.branch._prefs.prefIsLocked(this.name);
    },

    set locked(aValue) {
        this.branch._prefs[aValue ? "lockPref": "unlockPref"](this.name);
    },

    get modified() {
        return this.branch._prefs.prefHasUserValue(this.name);
    },

    get branch() {
        return this._branch;
    },

    get events() {
        return this._events;
    },

    reset: function pref_reset() {
        this.branch._prefs.clearUserPref(this.name);
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extIPreference])
};

//=================================================
// SessionStorage constructor
function SessionStorage() {
    this._storage = {};
    this._events = new Events();
}

//=================================================
// SessionStorage implementation
SessionStorage.prototype = {
    get events() {
        return this._events;
    },

    has: function ss_has(aName) {
        return this._storage.hasOwnProperty(aName);
    },

    set: function ss_set(aName, aValue) {
        this._storage[aName] = aValue;
        this._events.dispatch("change", aName);
    },

    get: function ss_get(aName, aDefaultValue) {
        return this.has(aName) ? this._storage[aName] : aDefaultValue;
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extISessionStorage])
};

//=================================================
// Extension constructor
function Extension(aItem) {
    this._item = aItem;
    this._firstRun = false;
    this._prefs = new PreferenceBranch("extensions." + this._item.id + ".");
    this._storage = new SessionStorage();
    this._events = new Events();

    var installPref = "install-event-fired";
    if (!this._prefs.has(installPref)) {
        this._prefs.setValue(installPref, true);
        this._firstRun = true;
    }

    this._enabled = false;
    const PREFIX_ITEM_URI = "urn:mozilla:item:";
    const PREFIX_NS_EM = "http://www.mozilla.org/2004/em-rdf#";
    var rdf = Cc["@mozilla.org/rdf/rdf-service;1"].getService(Ci.nsIRDFService);
    var itemResource = rdf.GetResource(PREFIX_ITEM_URI + this._item.id);
    if (itemResource) {
        var extmgr = Cc["@mozilla.org/extensions/manager;1"].getService(Ci.nsIExtensionManager);
        var ds = extmgr.datasource;
        var target = ds.GetTarget(itemResource, rdf.GetResource(PREFIX_NS_EM + "isDisabled"), true);
        if (target && target instanceof Ci.nsIRDFLiteral) this._enabled = (target.Value != "true");
    }

    var os = Components.classes["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
    os.addObserver(this, "em-action-requested", false);

    var self = this;
    gShutdown.push(function() {
        self._shutdown();
    });
}

//=================================================
// Extension implementation
Extension.prototype = {
    // cleanup observer so we don't leak
    _shutdown: function ext_shutdown() {
        var os = Components.classes["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
        os.removeObserver(this, "em-action-requested");

        this._prefs = null;
        this._storage = null;
        this._events = null;
    },

    // for nsIObserver
    observe: function ext_observe(aSubject, aTopic, aData) {
        if ((aSubject instanceof Ci.nsIUpdateItem) && (aSubject.id == this._item.id)) {
            if (aData == "item-uninstalled") this._events.dispatch("uninstall", this._item.id);
            else if (aData == "item-disabled") this._events.dispatch("disable", this._item.id);
            else if (aData == "item-enabled") this._events.dispatch("enable", this._item.id);
            else if (aData == "item-cancel-action") this._events.dispatch("cancel", this._item.id);
            else if (aData == "item-upgraded") this._events.dispatch("upgrade", this._item.id);
        }
    },

    get id() {
        return this._item.id;
    },

    get name() {
        return this._item.name;
    },

    get enabled() {
        return this._enabled;
    },

    get version() {
        return this._item.version;
    },

    get firstRun() {
        return this._firstRun;
    },

    get storage() {
        return this._storage;
    },

    get prefs() {
        return this._prefs;
    },

    get events() {
        return this._events;
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extIExtension])
};

//=================================================
// Extensions constructor
function Extensions() {
    this._extmgr = Components.classes["@mozilla.org/extensions/manager;1"].getService(Ci.nsIExtensionManager);

    this._cache = {};

    var self = this;
    gShutdown.push(function() {
        self._shutdown();
    });
}

//=================================================
// Extensions implementation
Extensions.prototype = {
    _shutdown: function exts_shutdown() {
        this._extmgr = null;
        this._cache = null;
    },

    /*
   * Helper method to check cache before creating a new extension
   */
    _get: function exts_get(aId) {
        if (this._cache.hasOwnProperty(aId)) return this._cache[aId];

        var newExt = new Extension(this._extmgr.getItemForID(aId));
        this._cache[aId] = newExt;
        return newExt;
    },

    get all() {
        return this.find({});
    },

    // XXX: Disabled until we can figure out the wrapped object issues
    // id: "some@id" or /id/
    // name: "name" or /name/
    // version: "1.0.1"
    // minVersion: "1.0"
    // maxVersion: "2.0"
    find: function exts_find(aOptions) {
        var retVal = [];
        var items = this._extmgr.getItemList(Ci.nsIUpdateItem.TYPE_EXTENSION, {});

        for (var i = 0; i < items.length; i++) {
            retVal.push(this._get(items[i].id));
        }

        return retVal;
    },

    has: function exts_has(aId) {
        return this._extmgr.getItemForID(aId) != null;
    },

    get: function exts_get(aId) {
        return this.has(aId) ? this._get(aId) : null;
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extIExtensions])
};

//=================================================
// extApplication constructor
function extApplication() {}

//=================================================
// extApplication implementation
extApplication.prototype = {
    initToolkitHelpers: function extApp_initToolkitHelpers() {
        this._console = null;
        this._storage = null;
        this._prefs = null;
        this._extensions = null;
        this._events = null;

        this._info = Cc["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULAppInfo);

        var os = Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);

        os.addObserver(this, "final-ui-startup", false);
        os.addObserver(this, "quit-application-requested", false);
        os.addObserver(this, "xpcom-shutdown", false);
    },

    // get this contractID registered for certain categories via XPCOMUtils
    _xpcom_categories: [
    // make Application a startup observer
    {
        category: "app-startup",
        service: true
    },

    // add Application as a global property for easy access
    {
        category: "JavaScript global privileged property"
    }],

    // for nsIClassInfo
    flags: Ci.nsIClassInfo.SINGLETON,
    implementationLanguage: Ci.nsIProgrammingLanguage.JAVASCRIPT,

    getInterfaces: function app_gi(aCount) {
        var interfaces = [Ci.extIApplication, Ci.nsIObserver, Ci.nsIClassInfo];
        aCount.value = interfaces.length;
        return interfaces;
    },

    getHelperForLanguage: function app_ghfl(aCount) {
        return null;
    },

    // extIApplication
    get id() {
        return this._info.ID;
    },

    get name() {
        return this._info.name;
    },

    get version() {
        return this._info.version;
    },

    // for nsIObserver
    observe: function app_observe(aSubject, aTopic, aData) {
        if (aTopic == "app-startup") {
            this.events.dispatch("load", "application");
        } else if (aTopic == "final-ui-startup") {
            this.events.dispatch("ready", "application");
        } else if (aTopic == "quit-application-requested") {
            // we can stop the quit by checking the return value
            if (this.events.dispatch("quit", "application") == false) aSubject.data = true;
        } else if (aTopic == "xpcom-shutdown") {

            this.events.dispatch("unload", "application");

            // call the cleanup functions and empty the array
            while (gShutdown.length) {
                gShutdown.shift()();
            }

            // release our observers
            var os = Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);

            os.removeObserver(this, "final-ui-startup");
            os.removeObserver(this, "quit-application-requested");
            os.removeObserver(this, "xpcom-shutdown");

            this._info = null;
            this._console = null;
            this._prefs = null;
            this._storage = null;
            this._events = null;
            this._extensions = null;
        }
    },

    get console() {
        if (this._console == null) this._console = new Console();

        return this._console;
    },

    get storage() {
        if (this._storage == null) this._storage = new SessionStorage();

        return this._storage;
    },

    get prefs() {
        if (this._prefs == null) this._prefs = new PreferenceBranch("");

        return this._prefs;
    },

    get extensions() {
        if (this._extensions == null) this._extensions = new Extensions();

        return this._extensions;
    },

    get events() {
        if (this._events == null) this._events = new Events();

        return this._events;
    },

    // helper method for correct quitting/restarting
    _quitWithFlags: function app__quitWithFlags(aFlags) {
        let os = ["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
        let cancelQuit = ["@mozilla.org/supports-PRBool;1"].createInstance(Ci.nsISupportsPRBool);
        os.notifyObservers(cancelQuit, "quit-application-requested", null);
        if (cancelQuit.data) return false; // somebody canceled our quit request
        let appStartup = ['@mozilla.org/toolkit/app-startup;1'].getService(Ci.nsIAppStartup);
        appStartup.quit(aFlags);
        return true;
    },

    quit: function app_quit() {
        return this._quitWithFlags(Ci.nsIAppStartup.eAttemptQuit);
    },

    restart: function app_restart() {
        return this._quitWithFlags(Ci.nsIAppStartup.eAttemptQuit | Ci.nsIAppStartup.eRestart);
    },

    QueryInterface: XPCOMUtils.generateQI([Ci.extIApplication, Ci.nsISupportsWeakReference])
};